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57Fe Mössbauer spectroscopic study on the magnetic properties of tantalum-doped maghemite and hematite

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Abstract

Unique and distinct structural and magnetic characteristics of Fe2O3 have been continuously studied for their broad potential and applications, and various attempts were conducted to enhance the properties. Ta5+-doped Fe2O3 were synthesized using sol-gel method followed by calcination at various temperatures. The formation mechanism based on PXRD and TEM EDS shows that Ta was included in Fe2O3 structure during γ phase then shifted to the surface during transformation to α phase, resulting in big hematite particle with small particle of FeTaO4 on the surface. Ta doping shows an influence on γ-Fe2O3 by increasing its stability and a significant influence on the magnetic properties of hematite. 1.9%Ta-doped samples calcined at 500 and 700 ºC show the coexistence of antiferromagnetism and weak ferromagnetism at 78 K. For the α-Fe2O3 including 7.4 atomic percent of Ta calcined at 700 ºC, the particle shows large size of 300 nm but there is no Morin transition temperature (TM) at 78 K.

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All data and materials supporting the findings of the research presented in this manuscript are available upon request. We are committed to promoting transparency and the sharing of research resources to facilitate the replication and verification of our work.

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Authors and Affiliations

  1. Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, 739-8526, Higashi-Hiroshima, Hiroshima, Japan

    Habibur Rahman & Satoru Nakashima

  2. Natural Science Center for Basic Research and Development (N-BARD), Hiroshima University, 1-4-2 Kagamiyama, 739-8526, Higashi-Hiroshima, Hiroshima, Japan

    Satoru Nakashima

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  1. Habibur Rahman
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Habibur Rahma develop the research, did experiment and wrote the manuscript. Satoru Nakashima evaluate and reviewed the result and the manuscript.

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Correspondence to Satoru Nakashima.

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Rahman, H., Nakashima, S. 57Fe Mössbauer spectroscopic study on the magnetic properties of tantalum-doped maghemite and hematite. Hyperfine Interact 245, 6 (2024). https://doi.org/10.1007/s10751-024-01841-0

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